Right now Mozilla is in a deal with Google.

If Firefox numbers drop below a threshold, we can only pray, Google doesn't alter the deal any further.

Not to mention Google gets carte blanche to basically control Web Standards as they see fit, since they are the only implementer (that counts).

- Don't want PNaCl? Too bad.

- Dart on the Web? You can't remove it even if you want it. Oh and you better support it, cause if your browser doesn't have feature parity with Chrome, you are doomed.

- Rust in browser? You can only dream.

- Browsers that use more GPU and SIMD? Too much of a hassle.